We have a caveat in our trauma policy that if a pediatric patient has been transfused with type O red cells, you cannot switch to type specific red cells until a new sample shows that they are compatible. I would like to get rid of it; it is an awkward thing to do in the middle of a trauma, but I recently read somewhere that this is the proper thing to do. However, now that I'm trying to find it again, I can't remember where I saw it. What do others do, and does anyone know where this reference is? Jerry Sapp